Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9c4cb431ca5967…

MALICIOUS

PDF

74.6 KB Created: 2021-06-12 01:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: deb14c28f3d0ba5f82968baa3ff9bad7 SHA-1: 5123b638a6906b7b36218bd7aea913285d23139b SHA-256: db9c4cb431ca596751283df2486b4abd9eea28a2351beee9781c8b4ce27404ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which are to PDF files, suggesting a link farm designed to manipulate search engine rankings or lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards a campaign to distribute or host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/123?utm_term=army+of+two+pc+game+free
    • https://garijonomiwobe.weebly.com/uploads/1/3/4/7/134711127/nusirujorovemifa.pdf
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/2169876.pdf
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/406aca5ea.pdf
    • https://nosokubidudat.weebly.com/uploads/1/3/4/3/134321305/269dfabb.pdf
    • https://benukozememig.weebly.com/uploads/1/3/4/4/134480731/godowoguwetanegimise.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a17ddbe5-076c-47b8-a7fa-7fc9ccb7ce1f/watch_my_sweet_audrina_movie_online_free.pdf
    • https://uploads.strikinglycdn.com/files/2fa632a2-5ec8-4a10-b28a-0ad11ca3047e/xolejidabobulagis.pdf
    • https://uploads.strikinglycdn.com/files/51b43553-4b6a-4005-ac34-573f641ce1aa/nulaxy_km28_manual.pdf
    • http://kufavuva.pbworks.com/f/77643883419.pdf
    • https://uploads.strikinglycdn.com/files/b81d583c-0ef5-4840-9ab9-a7db83cb17fa/fapemosoludasimalovix.pdf
    • https://uploads.strikinglycdn.com/files/0a4c8789-a19e-4ef4-ad50-737c27fd3dd8/how_to_add_positive_and_negative_numbers_in_sql.pdf
    • https://uploads.strikinglycdn.com/files/37f6fe78-203b-4d5d-9e86-4f932d7accb5/xovekabuji.pdf
    • http://jitilabajeko.pbworks.com/f/how_to_cook_kirkland_salmon.pdf
    • https://uploads.strikinglycdn.com/files/03100d55-adbd-4755-9d79-d4d292233464/nativimarumefegalenepor.pdf
    • http://radejaki.pbworks.com/f/stres_ynetimi_ve_fke_kontrol_sunum.pdf
    • https://uploads.strikinglycdn.com/files/f6fe5177-4aa8-49de-b121-8968a6530c41/b_m_r_ka_full_form.pdf
    • https://uploads.strikinglycdn.com/files/2e740211-1db4-482f-a644-46aab4ebc1c4/20421866754.pdf
    • https://uploads.strikinglycdn.com/files/a68e0403-6246-438d-b936-8c7914360b1c/what_is_media_news.pdf
    • https://uploads.strikinglycdn.com/files/478aec9d-dd54-4d15-8d3d-4e5652162ba7/how_to_connect_philips_universal_remote_to_vizio_tv.pdf
    • https://uploads.strikinglycdn.com/files/9a40a2f1-9840-4615-8d0a-6298d82336ac/2007_jeep_grand_cherokee_cranks_but_wont_start.pdf
    • http://fotikeralo.pbworks.com/w/file/fetch/144602073/2168185241.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a1.bin
0791e6bcf9ece40c88d61047315e2e704696a0c2e1859faf46b6206269bf2bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 5308 bytes
font_01_sfnt_off0000f7be.bin
c054b6c3bdbeffceee605006b3e95647e5fceba253cec08422f9211fd4523635		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 11120 bytes

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